Answer:
2 mol
Explanation:
NH4Br = NH4+ + Br-
1 mole of NH4+ and 1 mole of Br.
Any observations collected from Parts A and B were obtained by testing solutions with a single cation present. Would the presence of two cations in one solution (like that of the unknown) affect the cation identification in Part C?
Answer:
Yes
Explanation:
The two cations in the unknown can react with the reagent added for a particular test. The observation of the reaction for one cation can mask the other cation in solution making it difficult to identify either cation.
An ion carrying a positive charge is called a cation. The presence of two cations in a solution will affect the identification of cations in the C part.
What is a qualitative analysis of cation?In the qualitative analysis the chemical and the analytical process of identification of the ions in a mixture of sample solution. The cations and the anion gets separated in a mixture by the addition of a particular reagent.
The presence of two cations in an unknown mixture can alter and interfere with the reagent added to detect the third cation. The cation can mask and hinder the presence of another cation in the mixture by reacting with it.
Therefore, yes the two cations can affect the identification of the third cation.
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The chemistry of anhydrides is similar to that of acid chlorides, although they react more slowly.
a. True
b. False
Answer:
both
Explanation:
Write a half equation for each of the following.
a) The process at the positive electrode in the electrolysis of molten
calcium oxide.
b) The process at the negative electrode in the electrolysis of molten
potassium bromide.
Answer: Write a half equation for each of the following.
a) The process at the positive electrode in the electrolysis of molten
calcium oxide.
b) The process at the negative electrode in the electrolysis of molten
potassium bromide.
Explanation: a) The process at the positive electrode in the electrolysis of molten
calcium oxide.
How many grams of sodium metal are needed to react with 40.1 grams of hydrochloric acid?
Answer:
23.1 grams of sodium is use for this kind of stuff
Compare the reactivity between lithium and sodium towards oxygen.
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What is the concentration of a solution that contains 12 moles of solute in 4 liters of solution?
• 6M
• 12M
• 7M
• 3M
Answer:
Molarity of a solution is defined as number of moles of solute per litre of solution.Mathematically we can write
molarity = (number of moles of solute) / (volume of solution in litres)
It's units are mol/L also denoted by M.
So for this question answer is 6/2 =3mol/L Or 3M
Who is the Chief of GTOCP
Answer:
???
Explanation:
What volume (in mL) of water must you add to 25.0 mL of a 0.250 M NaBr solution to produce a 0.0275 M solution? Assume the volumes are additive.
Answer:
The volume of water added to make the diluted solution is 118.68 mL.
To solve this question, we'll begin by calculating the volume of the diluted solution. This can be obtained as follow:
Volume of stock solution (V₁) = 25 mL
Molarity of stock solution (M₁) = 0.250 M
Molarity of diluted solution (M₂) = 0.0435 M
Volume of diluted solution (V₂) =?
The volume of the diluted solution can be obtained as follow:
M₁V₁ = M₂V₂
0.25 × 25 = 0.0435 × V₂
6.25 = 0.0435 × V₂
Divide both side by 0.0435
V₂ = 6.25 / 0.0435
V₂ = 143.68 mL
Thus, the volume of the diluted solution is 143.68 mL
Finally, we shall determine the volume of water added to make the diluted solution.
Volume of stock solution (V₁) = 25 mL
Volume of diluted solution (V₂) = 143.68 mL
Volume of water added =?
Volume of water added = (Volume of diluted solution) – (Volume of stock solution)
Volume of water added = 143.68 – 25
Volume of water added = 118.68 mL
Therefore, the volume of water added to make the diluted solution is 118.68 ml
HOPE IT'S HELPFULMARK ME BRAINLIESTRadioactive iodine, used to treat thyroid cancer, has a half-life of eight days. Find its decay constant, r.
The decay constant of the radioactive iodine is r =0.086625
Radioactive decay is defined as the spontaneous reaction which occurs when an unstable atomic nuclei disintegrates form more stable nuclei.decay constant shows how the rate of the size of the parent nuclei decreases with time due to radioactive decay.
Now,
Let N be the size of a population of radioactive atoms at a given time t, and dN, the amount by which the population decreases in time dt
So that the rate of change is given by
dN/dt = −λN, ((where λ is the decay constant).
By Integration, We have
N = N0e−λt, ( where N0 is the size of an initial population of radioactive atoms at time t = 0)
We can see that the population decays exponentially which is dependent on the decay constant.
Now the half life is defined as the time it will take for half of the original population of radioactive atoms to decay.The relationship between the half-life, T1/2, and the decay constant, λ. is given by T1/2 = 0.693/λ.Therefore, for a radioactive iodine with half life of 8days , The decay constant will be
λ = 0.693/ T1/2 or
r = 0.693/ T1/2
r = 0.693/ 8days
r =0.086625
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50 POINTS !! I have a science project that I need help with its called pH
Project: Researching Acid Rain if anyone knows the answer or has down it before let me know.
Answer:
Acidic solutions are measured to have lower pH values than basic or alkaline solutions.
Explanation:
So basically acids have a lower pH than other liquids like water.
What is the molar mass of a gas with a density of 3.45 g/L at a
temperature of 280 K and a pressure of 100 kPa?
Answer:80.3
Explanation
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The the molar mass of gas is 86.25g/mol.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the rock ÷volume marked on the graduated cylinder
In 1L of solution the mass of glass is 3.45 g
Ideal gas law
PV=nRT
P= pressure of gas = 100 kPa= 100000Pa=0.98atm
V=1L= volume of gas
n= number of moles=?
R= gas constant = 0.0821atmK⁻¹mol⁻¹
T= temperature=280 K
Substituting the values in ideal gas equation
P×V=n×R×T
P×V=n×R×T
0.98atm×1=n×0.0821×280 K
n=0.04mole
n= given mass ÷Molar mass
Molar mass = 3.45 g ÷0.04mole=86.25g/mol
Therefore the molar mass of gas is 86.25g/mol.
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Atoms are thermally promoted to the excited state through collisions in the plasma. As they return to a lower energy state, they emit photons.
a. True
b. False
Answer:
True
Explanation:
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26 Milkweed contains a poison known as cardenolides. Monarch butterflies eat the milkweed plant and hold on to this toxic compound. The
chemical formula for cardenolides is shown below.
CH18C20H15CHCO2
Problem
How many atoms of each element are in one molecule of cardenolides?
A
42 carbon atoms, 23 hydrogen atoms, and 2 oxygen atoms
B
20 carbon atoms, 33 hydrogen atoms, and 2 oxygen atoms
с
34 carbon atoms, 43 hydrogen atoms, and 2 oxygen atoms
D
23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms
please help ASAP !!
Answer: D
Explanation:
The subscript on each element tells us the number of atoms.
Adding up all the numbers directly after C we get 23.
Adding up all the numbers directly after H we get 34.
Adding up all the numbers directly after O we get 2.
nvm.mmmmmmmmmmmmmmmmmmmmm
o_o mmmmmmmmmmmmm hjkkkjc
Answer:
I'm not the animal Crossing
A foliation
B. grains
C. igneous rock
D. lava
E lithification
1. a naturally occurring solid mixture made of
minerals, rock fragments, organic matter, or glass
2. the individual particles in rocks
3. type of rock that forms when magma or lava
cools and hardens
4. molten rock found inside Earth
5. molten rock that erupts onto Earth's surface
6. type of rock made of layers that are pressed or
cemented together
7. process through which sediment turns into rock
8. type of rock that results from changes that occur
in existing rocks
9. name for the original rocks that are changed into
metamorphic rocks
10. Metamorphic rock sometimes has this layered
appearance.
F.
magma
G. metamorphic
H. parent rock
i rock
J. sedimentary
Answer:
B.Grains
Explanation:
H.parent rock
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Answer:
I think is b
Explanation:
The change in internal energy for the combustion of 1.0 molmol of octane at a pressure of 1.0 atmatm is -5084.1 kJkJ . Part A If the change in enthalpy is -5074.4 kJkJ , how much work is done during the combustion
Answer:
W = -10.3 kJ
Explanation:
During combustion, the system performs work and releases heat. Therefore, the change in internal energy is negative, and the change in enthalpy, which is equal to heat at constant pressure, is also negative. Work is then calculated by rearranging the equation for the change in internal energy:
w=ΔE−qp=−5084.3 kJ−(−5074.0 kJ)
The release of heat is much greater than the work performed by the system on its surroundings. The potential energy stored in the bonds of octane explains why considerably large amounts of energy can be lost by the system during combustion.
The work done during the combustion is mathematically given as
w= −10.3kJ
What is the work done during the combustion?Question Parameter(s):
The change in internal energy for the combustion of 1.0 molmol of
octane at a pressure of 1.0 atmatm is -5084.1 kJkJ .
Generally, the equation for the workdone is mathematically given as
w=ΔE−qp
w=−5084.3 kJ−(−5074.0 kJ)
w= −10.3kJ
In conclusion, the work done
w= −10.3kJ
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It’s 10pm at 45°W. What time will it be at 45°E?
Answer:
11:30am
Explanation:
45 + 45 = 90
90 = 1 hrs 30 mins
10 pm + 1 hrs 30 mins
= 11:30 am
The process of releasing energy through the spitting of an atom is:
Answer:
When an atom splits into two parts, either through natural decay or when instigated within a lab, it releases energy. This process is known as fission.
Explanation:
Fission
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A chemical reaction produces formaldehyde, with a chemical formula of CH2O. Carbon is in Group 4A, oxygen is in Group 6A, and hydrogen is in Group 1A on the periodic table. In one to two sentences, describe the bonds in a molecule of formaldehyde in terms of valence electrons.
The formaldehyde has the molecular formula HCHO. Two C-H bonds have been present in the structure, while there has been the presence of one C=O bond.
Carbon belongs to group 4A and has been consisted of four valence electrons. In order to complete its octet, carbon gets covalently bonded with the hydrogen of the 1A group consisting of 1 valence electron.
The covalent bond between carbon and hydrogen results in the complete octet of the hydrogen, however, carbon has 2 valence electrons to be bonded to complete the octet.
The oxygen has been belonging to group 6A and has been consisted of 6 valence electrons. In order to complete the octet, oxygen required 2 valence electrons. The carbon bonds with the oxygen with the double bond completing the octet of the oxygen and carbon.
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Answer:
The bonds in a molecule of formaldehyde are that there is 2 C-H bonds and one C-O bond present. Since carbon is in group 4A meaning it has 4 valence electron, Hydrogen has 1 valence electron, and oxygen has 6 valence electron. Carbon and Hydrogen valance electrons can complete carbons octet. The other two valence electron of carbon and the six valence electron of oxygen can complete oxygens octet.
Explanation:
how does the muscular system depend on the skeletal system
Answer: Vertebrates move by the actions of muscles on bones. Tendons attach many skeletal muscles across joints, allowing muscle contraction to move the bones across the joint.
Explanation:
Answer: The muscular system works in conjunction with the skeleton to produce movement of the limbs and body.
False and Ture
Air is denser
near Earth's
surface than
high in the
atmosphere.
Answer:
Wind is the movement of air from an area of low pressure to an area of high pressure. TRUE. As you move upward from Earth's surface, wind speeds increases because the air meets with less friction from Earth's surface.
describe some acidic oxides that can be prepared by the thermal decomposition of nitrates and carbonates.
Answer:
nitrogen dioxide and oxygen gas
Explanation:
the compounds are white solids and brown nitrogen dioxide and oxygen gases are also given off when heated.
Which solid object has the highest specific heat?
-aluminum
-silver
-wood
-ice
Answer:
Aluminum
Explanation:
Because aluminum temperature changed less than the copper's did under the same condition. This, the aluminum must require more energy to change its temperature
Describe the difference between at atom and an ion in regards to their substaomic
particles.
Answer:
-Atoms are neutral; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.
-An atom has an equal number of protons and electrons. An ion has an imbalance between the number of protons and electrons.
-An atom has no electrical charge. Ions have an electrical charge because they have an imbalance of protons and electrons.
Explanation:
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A student practicing for track ran 250 meters in 25 seconds what was her speed in m/ seconds
4. Determine how many molecules are in 7.00 mol Fe2O3
I would divided it to get the anwser and then moloeces
Explanation:
Divide
OXIDATION ELECTRON TRANSFER
which phrase best describes oxidation?
gain of cations
gain of electrons
loss of electrons
loss of cations
Answer:
Loss of electrons
Explanation:
Oxidation occurs in a redox reaction where electrons are transferred from one reactant to another.
The loss of electrons is called oxidation.The gaining of electrons is called reduction.The reactant that causes oxidation is called the oxidizing agentThe reactant that causes reduction is called the reduction agentOxidation reaction can be described as the loss of electrons. Therefore, option (C) is correct.
What is oxidation?Oxidation can be described as a chemical reaction that takes place in an atom or compound and results in the loss of electrons.
Oxidation is the loss of electrons and happens when an atom or chemical compound loses one or more electrons. Some elements have a tendency to lose electrons more easily than others and are said to be easily oxidized. Metals such as magnesium, sodium, and iron are easily oxidized.
Elements that are reluctant to lose electrons are not easily oxidized they hold tightly their electrons. Nonmetals such as oxygen, nitrogen, and chlorine are not easily oxidized.
Most of the time, oxidation takes place with a process called reduction. The reduction can be defined as the process of gaining electrons. In an oxidation-reduction reaction, one atom or compound will give or take electrons from another atom or compound.
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Silver plating uses the reaction How many moles of electrons must pass through an electrolytic cell for silver plating in order to plate 3 moles of ag
The number of mole of electron that must pass through an electrolytic cell for silver plating in order to plate 3 moles of Ag is 3 moles of electrons
We'll begin by writing the balanced equation for the reaction to determine how many mole of electron will yield 1 mole of Ag.
Ag⁺ + e —> Ag
From the balanced equation above,
1 mole of Ag required 1 mole of electron.
With the above information, we can obtain the number of electrons needed to produce 3 moles of Ag. This can be obtained as follow:From the balanced equation above,
1 mole of Ag required 1 mole of electron.
Therefore,
3 moles of Ag will also require 3 moles of electrons
Thus, 3 moles of electrons is needed to yield 3 moles of Ag
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What is the answer?
Answer:
What sub
Explanation:
